## Connecting small generators in series?

Hi all,

I'd like to make a bunch of small generators, like Pleech turbines, for example. Each one might only be producing a couple volts and however much power. What is the best way to connect them together to get their combined power?

I was thinking that I could just give each generator its own rectifier, and then connect everything together in series. Would that be efficient?

My circuitry understanding is a little limited, so a simple solution that is 90% efficient may be better than a complicated solution that's 100% efficient.... :)

Thanks for any suggestions!

I'd like to make a bunch of small generators, like Pleech turbines, for example. Each one might only be producing a couple volts and however much power. What is the best way to connect them together to get their combined power?

I was thinking that I could just give each generator its own rectifier, and then connect everything together in series. Would that be efficient?

My circuitry understanding is a little limited, so a simple solution that is 90% efficient may be better than a complicated solution that's 100% efficient.... :)

Thanks for any suggestions!

active| newest | oldestIn summary you can do it, but you will probably have to down grade the expected wattage from each generator due to reactive load between generators. You will also want to pay close attention to the phase angle between generators to keep a smooth voltage and torque on the prime mover.

An additional note. in the link below I set low voltage drop across the diodes. but in normal diodes there is a a voltage drop of about .70o something milivolts. each bridge rectifyer always is always passing current through two so each bridge will drop about 1.6v. Meaning you loose power in each series connected bridge rectifier.

Here is something you can play with

http://tinyurl.com/lwyc5bt

You can play with any value voltage resistance inductance, and phase angle.

The transformers representing the generator's coils with their inductance and power being supplied from an alternating magnetic field. The resistor in series represents a coil's internal copper resistance. Here I have the three generators out of phase by 120 degrees from each other to limit torque ripple.

Now normally, as you can see on the left, even AC power from a single source is generally always negative, or power is drawn from the source, unless the load has any inductive or capacitive reactance. As you see in the series connected motors, positive power means power from another generator is being channeled through the first series connected generator. Additionally, look at the amount of wattage in the first series connected generator has a lot more watts being drawn from it. It seams to me that power is being absorbed into the coils from another generator and reflecting back out. This might be a concern when considering how much to load the generators.

Generally its a good idea to have three single phase generators out of phase by 120 degrees. Else you will pulse torque back to the prime mover very strongly if you align all the phases up in the same direction. 180 degrees out of phase is indistinguishable from 0 degrees after rectification. http://tinyurl.com/lwyc5bt

You will still momentarily cause the generators to motor. Look at the positive power flow. http://tinyurl.com/lwyc5bt

"The generators may even start trying to act as motors. Would this be a real problem? Would there be a clever way to prevent it?" No. http://tinyurl.com/lwyc5bt This is probably a better representation with the the transformers representing the generator's coils with their inductance and power being supplied from an alternating magnetic field. The resistor in series represents a coil's internal copper resistance. Here I have the three generators out of phase by 120 degrees from each other to limit torque ripple.

Now normally, as you can see on the left, even AC power from a single source is generally always negative, or power is drawn from the source, unless the load has any inductive or capacitive reactance. As you see in the series connected motors, positive power means power from another generator is being channeled through the first series connected generator. Additionally, look at the amount of wattage in the first series connected generator has a lot more watts being drawn from it. It seams to me that power is being absorbed into the coils from another generator and reflecting back out. This might be a concern when considering how much to load the generators.